tun: fix build warnings
Stephen Rothwell reports a build warnings(powerpc ppc64_defconfig)
drivers/net/tun.c: In function 'tun_do_read.part.5':
/home/sfr/next/next/drivers/net/tun.c:1491:6: warning: 'err' may be
used uninitialized in this function [-Wmaybe-uninitialized]
int err;
This is because tun_ring_recv() may return an uninitialized err, fix this.
Reported-by: Stephen Rothwell <sfr@canb.auug.org.au>
Signed-off-by: Jason Wang <jasowang@redhat.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 7475215..5eadb7a 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -1447,12 +1447,13 @@
{
DECLARE_WAITQUEUE(wait, current);
struct sk_buff *skb = NULL;
+ int error = 0;
skb = skb_array_consume(&tfile->tx_array);
if (skb)
goto out;
if (noblock) {
- *err = -EAGAIN;
+ error = -EAGAIN;
goto out;
}
@@ -1464,11 +1465,11 @@
if (skb)
break;
if (signal_pending(current)) {
- *err = -ERESTARTSYS;
+ error = -ERESTARTSYS;
break;
}
if (tfile->socket.sk->sk_shutdown & RCV_SHUTDOWN) {
- *err = -EFAULT;
+ error = -EFAULT;
break;
}
@@ -1479,6 +1480,7 @@
remove_wait_queue(&tfile->wq.wait, &wait);
out:
+ *err = error;
return skb;
}